Remove support for the LEGACY_CSS_VENDOR_PREFIXES compile-time flag.

Source/WebCore/css/CSSParser.cpp

 /*
  * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
  * Copyright (C) 2012 Intel Corporation. All rights reserved.
  *
@@ skipping 11764 matching lines @@
     for (unsigned i = 0; i != length; ++i) {
         CharacterType c = propertyName[i];
         if (c == 0 || c >= 0x7F)
             return CSSPropertyInvalid; // illegal character
         buffer[i] = toASCIILower(c);
     }
     buffer[length] = '\0';
 
     const char* name = buffer;
     if (buffer[0] == '-') {
-#if ENABLE(LEGACY_CSS_VENDOR_PREFIXES)
-        // If the prefix is -apple- or -khtml-, change it to -webkit-.
-        // This makes the string one character longer.
-        if (RuntimeEnabledFeatures::legacyCSSVendorPrefixesEnabled()
-            && (hasPrefix(buffer, length, "-apple-") || hasPrefix(buffer, length, "-khtml-"))) {
-            memmove(buffer + 7, buffer + 6, length + 1 - 6);
-            memcpy(buffer, "-webkit", 7);
-            ++length;
-        }
-#endif
 #if PLATFORM(IOS)
         cssPropertyNameIOSAliasing(buffer, name, length);
 #endif
     }
 
     const Property* hashTableEntry = findProperty(name, length);
     const CSSPropertyID propertyID = hashTableEntry ? static_cast<CSSPropertyID>(hashTableEntry->id) : CSSPropertyInvalid;
 
     static const int cssPropertyHistogramSize = numCSSProperties;
     if (hasPrefix(buffer, length, "-webkit-") && propertyID != CSSPropertyInvalid) {
@@ skipping 238 matching lines @@
 {
     // The tokenizer checks for the construct of an+b.
     // However, since the {ident} rule precedes the {nth} rule, some of those
     // tokens are identified as string literal. Furthermore we need to accept
     // "odd" and "even" which does not match to an+b.
     return equalIgnoringCase(token, "odd") || equalIgnoringCase(token, "even")
         || equalIgnoringCase(token, "n") || equalIgnoringCase(token, "-n");
 }
 
 }